In the official packaging of Nokia 8.1 - you will get your Nokia 8.1, USB Type C cable, Power adapter, Headset, Quick start guide & SIM door key.
Yes, Nokia 8.1 does have the 3.5 mm headphone jack. It also has Bluetooth A2DP support.
Yes, Nokia 8.1 does support Qualcomm Quick Charge. It also comes with 18W fast charger.
Yes, Nokia 8.1 comes with headphone in the box.